Withdraw it from the box, take it to Hoenn or Sinnoh and compete in contests after changing its moveset. You didn't say what kind of box after all. Also, people shouldn't be leaving their boxes logged into. ;)
I would be kind towards it. I would transport it to the pokémon dream world. From there I would destroy the cartridge it was found on, leaving no origin for there it shall serve the remainder of its life until the body atrophies and, its brain ceases to function. Or until the earth gets annihilated on the 21st of December 2012.